Fatboise wrote:
Aidan Wrote:
Aidan wrote:


And the heat transfer depends on the temperature difference.

If used to heat re-cycled (warm) room air with an extract air stream,
the efficiency will drop sharply, to the extent where the payback
achieved by the device (heat recovered v power consumed by the fans)
becomes dubious. Efficiency will be highest with cold incoming air.

Aidan, Thanks for your inputs. I looked at the vent-axia site and saw
that they supply the heat recovery units which I had looked into
somewhat when I thought of this project. The thing with my house is I
have a solid fuel "pot belly" stove in the Kitchen/living room which is
used during the winter. What I was planning was using the fan to move
the heat to the bedroom late in the evening just before we go to bed so
the remaining heat fromt he stove isn't lost in the Kitchen/living room
when there is nobody there. At this stage of the evening there should
be no cooking moisture or smells left in the room and if there is some
late cooking I can put up with that the few times that it happens. The
fan would be on for 1 hour at the most so I thought it wouldn't be
worthwhile investing in the heat exchanger unit.


--
Fatboise

Have same plan. Intend to blow the air from living room into the
ensuite shower cubicle in the bedroom. Whats best for duct - grey
rainwater goods or what?

cheers
Jacob